1. Kamenskii, G.A., Myshkis, A.D.: On the mixed type functional differential equations. Nonlinear Analysis, TMA. Vol. 30.5 (1997) 2577–2584
2. Kamenskii, G.A.: A review of the theory of mixed functional differential equations. Problems of Nonlinear Analysis in Engineering Systems. Vol. 2.8 (1998) 1–16
3. Kamenskii, G.A.: Boundary value problems for difference-differential equations arising from variational problems. Nonlinear Analysis, TMA. Vol. 18.8 (1992) 801–813
4. Kopylov, A.V.: Finite difference method for the numerical solution of boundary value problem for mixed difference-differential equation. Sib. J. Numer. Math. Vol. 3.4 (2000) 345–355 (Russian)
5. Skubachevskii, A.L.: Elliptic functional differential equations and applications. Birkhauser, Basel Boston Berlin (1997)